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High-Efficiency Solution-Processed Inorganic Metal Halide Perovskite Light-Emitting Diodes

Cited 158 time in Web of Science Cited 160 time in Scopus
Issue Date
2017-08
Citation
Advanced Materials, Vol.29 No.31, p. 1700579
Keywords
cesium lead halideselectron-phonon couplinginorganic halide perovskiteslight-emitting diodesnext-generation emitters
Abstract
This paper reports highly bright and efficient CsPbBr3 perovskite light-emitting diodes (PeLEDs) fabricated by simple one-step spin-coating of uniform CsPbBr3 polycrystalline layers on a self-organized buffer hole injection layer and stoichiometry-controlled CsPbBr3 precursor solutions with an optimized concentration. The PeLEDs have maximum current efficiency of 5.39 cd A(-1) and maximum luminance of 13752 cd m(-2). This paper also investigates the origin of current hysteresis, which can be ascribed to migration of Br-anions. Temperature dependence of the electroluminescence (EL) spectrum is measured and the origins of decreased spectrum area, spectral blue-shift, and linewidth broadening are analyzed systematically with the activation energies, and are related with Br-anion migration, thermal dissociation of excitons, thermal expansion, and electron-phonon interaction. This work provides simple ways to improve the efficiency and brightness of all-inorganic polycrystalline PeLEDs and improves understanding of temperature-dependent ion migration and EL properties in inorganic PeLEDs.
ISSN
0935-9648
URI
https://hdl.handle.net/10371/164463
DOI
https://doi.org/10.1002/adma.201700579
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Materials Science and Engineering (재료공학부)Journal Papers (저널논문_재료공학부)
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